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arXiv 1102.1967hep-ph
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强子对撞机上光子产生顶夸克对的QCD修正

QCD corrections to top quark pair production in association with a photon at hadron colliders

Kirill Melnikov, Andreas Scharf, Markus Schulze

摘要:

我们计算QCD修正的生产ttbar对与硬光子在Tevatron和LHC。这个过程允许直接测量顶夸克的电磁耦合,目前,只是松散的约束。我们包括顶夸克衰变,在窄宽度近似下处理它们,并保留末态粒子的自旋关联。在我们的计算中包括了顶夸克衰变产物的光子辐射,并产生了显着的贡献的横截面。我们研究次主导阶QCD修正的ppbar -> ttbar+伽马过程在Tevatron的选择标准,在最近的测量CDF合作。我们还讨论了QCD对pp -> ttbar+gamma过程的修正对14 TeV LHC上顶夸克电荷测量的影响。

英文摘要:

We compute QCD corrections to the production of a ttbar pair in association with a hard photon at the Tevatron and the LHC. This process allows a direct measurement of the top quark electromagnetic couplings that, at the moment, are only loosely constrained. We include top quark decays, treating them in the narrow width approximation, and retain spin correlations of final-state particles. Photon radiation off top quark decay products is included in our calculation and yields a significant contribution to the cross-section. We study next-to-leading order QCD corrections to the ppbar -> ttbar+gamma process at the Tevatron for the selection criteria used in a recent measurement by the CDF collaboration. We also discuss the impact of QCD corrections to the pp -> ttbar+gamma process on the measurement of the top quark electric charge at the 14 TeV LHC.

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